Definition: The term "arch-christendom" refers to a community or sect of Christians who maintain that Jesus Christ is God and are united under one faith, despite their religious differences. They adhere to orthodox Catholic doctrine and liturgy while also celebrating Christmas as the feast of the birth of Christ. This group often supports Pope Gregory XIII and sometimes challenges Vatican II. The term "arch-christendom" has no direct Biblical origin but originates from a medieval Latin translation of the Hebrew phrase "Archechimdeon," which means "a church that is above Christ."
arch-christendom